Add Docker workflow and Dockerfile for building and pushing images to Gitea registry

Dockerfile

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+FROM python:3.12-slim
+WORKDIR /app
+COPY yt-playlist-main.py /app/
+COPY bin/aria2c.exe /app/bin/
+COPY bin/ffmpeg.exe /app/bin/
+COPY bin/yt-dlp.exe /app/bin/
+ENV PATH="/app/bin:$PATH"
+CMD ["python", "yt-playlist-main.py"]